Which of these illustrates that sound waves can travel through two different types of media? A. Talking to some one under the pool B. Hearing a loud whisper across the room C. Hearing people talking on the other side of the wall D. Hear thunder from a very distant storm

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?

You can melt ice by applying pressure because the solid/liquid line has a slope.

In general what determines whether atoms will form chemical bonds?